Thank you Daniel, I tried turning off everything, all good, as soon as I turned 
on the Computer to check e-mails the loss of data started, so I’ll follow your 
advice Daniel and see if that helps, many thanks.

Tony

Sent from my iPhone

> On 18 Apr 2018, at 21:16, Daniel Kerr <[email protected]> wrote:
> 
> Hi Tony
> 
> Do you have any other devices/computers using the internet?
> Try turning all the computers and devices off, then see if in that same time 
> period (e.g. 30mins) if any usage is still being used. This will help narrow 
> it down a little bit. If there is no usage when nothing is on, then one would 
> assume it has to be being used by your devices.
> Then just have one computer or device on, and see if the usage still 
> increases. This helps narrow down where it may be used from.
> 
> One thing to check is System Preferences - App Store. Having it 
> “Automatically check for updates” is OK. But I tend to untick “Download newly 
> available updates in the background” or anything that says it’s going to auto 
> download and auto install. I do all those manually.
> 
> The iPhone will also do the same thing.
> Settings - iTunes and App Store. Automatic Updates etc. (You can also check 
> “Use Mobile Data” isn’t ticked at the same time as well - won’t affect this 
> issue, but just incase).
> Some Apps on devices can also use data. You can see these in Settings - 
> General - Backup App Refresh. You can turn the whole thing off, ,or turn it 
> off per App.
> 
> They’re a few places to start, and turn off to help narrow it down.
> 
> On the Mac, you can also see if you’re using Network usage from Applications 
> - Utilities. Open Activity Monitor. Click on Network, and you’ll see how much 
> data is being sent and received. If it’s hugely spiking, then you can see 
> it’s all coming from the computer.
> So it’s a matter of just going through everything and truely to narrow it 
> down / rule out what it may be, or which device is using it.
> 
> Hope that start helps.
> 
> Kind regards
> Daniel
> 
> Sent from my iPhone 7
> 
> ---
> Daniel Kerr
> MacWizardry
> 
> Phone: 0414 795 960
> Email: <daniel AT macwizardry.com.au>
> Web:   <http://www.macwizardry.com.au>
> 
> 
> **For everything Apple**
> 
> NOTE: Any information provided in this email may be my personal opinion and 
> as such should be taken accordingly, and may not be the views of MacWizardry. 
> Any information provided does not offer or warrant any form of warranty or 
> accept liability. It would be appreciated that if any information in this 
> email is to be disseminated, distributed or copied, that permission by the 
> author be requested. 
> 
>> On 18 Apr 2018, at 8:28 pm, Anthony (Tony) Francis <[email protected]> wrote:
>> 
>> Hello fellow members. 
>> I am having serious problems with Data use on my Computer( Telstra)I am 
>> using 1GB of Data approx’ every 10 15 minutes. It’s Telstra’s top up system 
>> when the normal data has run out. But it can cost up to $110. in 2 Hours, 
>> with only the Computer on, I have tried talking to Telstra ( India) and last 
>> night the Phillipines, not to bad, but no idea on what’s burning our data, 
>> it’s like we’re supplying the street with our wireless. Any ideas if it’s 
>> something we may have open on the Computer? We are doing nothing different 
>> than at any other time. 
>> Thanks Guy’s just thought I’d ask the question. Next stop the Ombudsman. 
>> Telstra Shops only handle Customer Plans and Sales, not Billing or Data 
>> problems. 
>> Kind Regards
>> 
>> Tony
>> Boddington.
>> 
>> Sent from my iPhone
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